Galileo Times


Galileo Discoveries

Among his many discoveries, Galileo discovered the first moons ever known to orbit a planet other than Earth, discovering Jupiter’s four largest moons: Io, Europa, Ganymede, and Callisto. Together these moons are now called the Galilean Satellites in his honor.

Early Life

As a young man, Galileo was torn between training to become a catholic priest or a doctor of medicine. His father encouraged him to study medicine, and Galileo took his father’s advice, starting a medical course at the University of Pisa when he was 17 years old. Soon, however, his father’s plans came unstuck.